This cable is typically used to connect up to 4 separate SATA drives to a SAS controller. SAS controller PCIe adapter expansion cards can be purchased cheaply online. Once I had both the SAS controller card and the hard drives, I was able to hook everything up and it worked! This particular wiring harness has 4 separate SATA cables that go into a SAS connector which then connects to a connector on the controller board. The advantage of SAS, however, is that very thin cables are used to connect to hard drives, allowing exceptional flexibility in cable routing in a busy computer case. be a solution to consider. highlighted.